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Behavior of oceanic currents in shelf regions

陆架区域洋流的行为

基本信息

批准号：
59460039
负责人：
NAGATA Yutaka
金额：
$ 3.97万
依托单位：
Faculty of Science, University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1984
资助国家：
日本
起止时间：
1984 至 1986
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-59460039/
关键词：
Oceanic current in shelf region Topographic effect 縁辺海

项目摘要

The Tsushima Current, the Soya Current and the Tsugaru Current flow in shallow shelf regions. The nature of these current is quite different from currents flowing open ocean, as their current keeps its considerable magnitude down to bottom and they receive significant friction form bottom. Knowledge of the currents in shelf regions is very limited though demands for it has been increased recently. Basic nature of the currents in shelf regions was studied through tank experiment, numerical modelling and data analysis. Dependence of current structure on the relative angle between coast line and inflow are examined. We succeeded to reproduce the current having shape of narrow band along the coast like the Soya Current when the inflow is directed to right and parallel to coast line, and the current with large eddy off the strait mouth like the Tsugaru Current when inflow direction is rectangular to the coast. Most interesting feature is observed when the inflow is directed towards left. The elliptic eddy is produced on front of strait mouth and the eddy rotates clockwise. The eddy is very unstable and breaks down in rather early stage. The detailed nature of the elliptic eddy was examined. The behavior of this complicated eddy motion seems to give some explanations of changeable feature of the Tsugaru Current and the Tsushima Current. We developed numerical two layer model which is applicable for local oceans with bottom topography. Though the application of the model has made only for specified phenomena in the present stage, the model was showed effective for the analysis of currents in shelf region. The data analysis was made for tidal records and temperature records taken on coastal stations and on board of regular liners. Results indicate that these can be used for monitoring oceanic currents in shelf regions.

对马洋流、大豆洋流和津轻洋流流经浅陆架区域。这些洋流的性质与流动在开阔海洋中的洋流有很大不同，因为它们的洋流在到达底部时保持相当大的强度，并且它们受到来自底部的显着摩擦。尽管最近对陆架区域海流的需求有所增加，但对陆架区域海流的了解非常有限。通过水池实验、数值建模和数据分析研究了陆架区域水流的基本性质。研究了当前结构对海岸线和入流之间相对角度的依赖性。我们成功地再现了当入流方向向右并与海岸线平行时，像豆谷海流那样沿着海岸具有窄带形状的洋流，以及当入流方向与海岸成直角时像津轻洋流那样在海峡口外有大涡流的洋流。当流入流向左侧时，观察到最有趣的特征。海峡口前方产生椭圆形涡流，涡流顺时针旋转。涡流非常不稳定，在很早的阶段就崩溃了。检查了椭圆涡流的详细性质。这种复杂涡流运动的行为似乎对津轻洋流和对马洋流的变化特征给出了一些解释。我们开发了适用于具有底部地形的局部海洋的数值两层模型。虽然现阶段该模型的应用仅针对特定现象，但该模型对于陆架区域的水流分析已显示出有效的效果。对沿海站和定期班轮上采集的潮汐记录和温度记录进行了数据分析。结果表明，这些可用于监测陆架区域的洋流。